Hi I am a new member to this site, Great information! I would like some information on a 1967 beaumont that I have recently purchased vin 7361771101553. It is not #'s matching as it has a 1972 454 big block. I would like to know what diff it would have as I am going to install a 5 speed trans this winter.
Hi, and welcome. You want the original diff, or are you asking for a decode on the one in the car presantly? Post the casting # and I'm sure somebody here can help you. P.s if you are ever in Surrey, stop in at the wheelhouse for a cold one for me.
Thanks for the reply. I would like to know what the original diff was and also where do I look for the casting # (I have looked and cannot find it) The part # on the pinion is 3802513-11-14 and the casting # on the crown gear housing is ED30140PUI. Does this help?
Welcome to the forum. ED30140 is a three series 12 bolt posi carrier acording to chevy by the numbers book. Are you sure the pinion number is 11-14 not 11-41 ? Usualy thats the gear ratio for that pinion 11-41 would be 3.73's but 11-14 would not make sense. If you have the back cover off count your pinion teeth and ring gear teeth. Divide the pinion into the ring gear for the ratio.
-- Edited by Beaumont4008 on Sunday 31st of January 2010 12:30:24 AM
Oh, and to prove what it had originally, you will need to find the numbers on the passenger side axle tube. It's hard to find. Front of the tube, usually a few inches outboard from where the tube goes in to the center housing casting. A mixture of digits and letters.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
Thanks for the reply. I would like to know what the original diff was and also where do I look for the casting # (I have looked and cannot find it) The part # on the pinion is 3802513-11-14 and the casting # on the crown gear housing is ED30140PUI. Does this help?
Could you check that number again on the gear? I am betting it's 3862513 and 11-41. That makes sense for 65-69 3.73 in the parts book I have. It has the stamping numbers for a lot of the different gear ratios.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
That's the one that was for sale in Victoria I think. Nice and red, you can't go wrong!! I'm a Island guy too so make sure you take it to the Duncan Beverly Corners car show this year and we can chat.
I rechecked the pinion # and is3862513-11-41. Thanks for the info. The only # I can read on the front of axle housing is C00103 B. Is this close? The cowl tag #'s are 736172-10-11 9 R no 09 831909 G50 D99N-m35 Numbers are hard to read does this look correct. Thanks to everyone for your help
C00103 B . CO in 67 is for 3.31 ratio. 0103 is date January third and B is the plant code for Buffalo NY . Your gear ratio has been changed to 3.73. Unless that CO is CC then it would be correct for a 3.73 ratio.
C00103 B . CO in 67 is for 3.31 ratio. 0103 is date January third and B is the plant code for Buffalo NY . Your gear ratio has been changed to 3.73. Unless that CO is CC then it would be correct for a 3.73 ratio.
And that would be unusual if they had been changed using GM gears. Typically, GM has had such a ridiculous price on gear sets that most people bought aftermarket.
Usually gears have a date code, at least the crown gear does. Any numbers on there ending in maybe 66? Something like 9 20 66 or something?
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
C00103 B . CO in 67 is for 3.31 ratio. 0103 is date January third and B is the plant code for Buffalo NY . Your gear ratio has been changed to 3.73. Unless that CO is CC then it would be correct for a 3.73 ratio.
It seems at that rate then that the housing would not be original to the car. Unlikely a housing would be stamped in January and only installed 9 months later in a car.
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1966 Strato Chief 2 door, 427 4 speed, 45,000 original miles
1966 Grande Parisienne, 396 1 of 23 factory air cars (now converted to a "factory" 4 speed)
